/*
 * BEEM is a videoconference application on the Android Platform.
 * Copyright (C) 2009 by Frederic-Charles Barthelery,
 * Jean-Manuel Da Silva,
 * Nikita Kozlov,
 * Philippe Lago,
 * Jean Baptiste Vergely,
 * Vincent Veronis.
 * This file is part of BEEM.
 * BEEM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * BEEM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with BEEM. If not, see <http://www.gnu.org/licenses/>.
 * Please send bug reports with examples or suggestions to
 * contact@beem-project.com or http://dev.beem-project.com/
 * Epitech, hereby disclaims all copyright interest in the program "Beem"
 * written by Frederic-Charles Barthelery,
 * Jean-Manuel Da Silva,
 * Nikita Kozlov,
 * Philippe Lago,
 * Jean Baptiste Vergely,
 * Vincent Veronis.
 * Nicolas Sadirac, November 26, 2009
 * President of Epitech.
 * Flavien Astraud, November 26, 2009
 * Head of the EIP Laboratory.
 */
package com.beem.project.beem.utils;

import java.io.IOException;
import java.net.ServerSocket;

/**
 * Utility class to get a free port.
 * 
 * @author nikita
 */
public final class FreePort {

	private static final int MAGIC_10 = 10;
	private static final int MAGIC_10000 = 10000;

	/**
	 * Private default constructor.
	 */
	private FreePort() {}

	/**
	 * return a free port.
	 * 
	 * @return free socket port.
	 */
	public static int getFreePort() {
		ServerSocket ss;
		int freePort = 0;

		for (int i = 0; i < MAGIC_10; i++) {
			freePort = (int) (MAGIC_10000 + Math.round(Math.random() * MAGIC_10000));
			try {
				ss = new ServerSocket(freePort);
				freePort = ss.getLocalPort();
				ss.close();
				return freePort;
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		try {
			ss = new ServerSocket(0);
			freePort = ss.getLocalPort();
			ss.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return freePort;
	}
}
